Transcript Product & Application Update

High Sensitivity External
Leak Detection for Liquid Fuel Pipelines
David Parman P.Eng.
Ken McCoy
Pipeline Leak Detection
The Problem:
How can we minimize environmental damage
caused by small leaks in liquid fuel pipelines that
go unnoticed for long periods?
The Solution:
High Sensitivity External Leak Detection
(HSELD)
2
What is an HSELD system?
• A system that operates independently of the
pipeline
• A system that directly detects leaked liquid using
a continuously distributed, high sensitivity sensor
• A system that monitors its own integrity and
checks for leaks on a 24/7 basis
• A system that compliments existing flow based
leak detection to minimize your leak risk
exposure
3
• Periodic tightness
testing
• Right of way overflights / Line Patrol
• Smart pigs
• Public discovery
=
Environmental
Protection Risk
Size of Spill at Detection
(bbls)
Periodic inspection and testing
600
500
60
days
30
days
7
days
400
300
200
At RISK !
Periodic
Inspections
100
0
0.001
0.01
0.1
Leak Rate (% of flow rate)
4
1
SCADA (Flow Based)
Leak Detection
• Response time is faster for
higher leak rates
• Greater leak sensitivity
leads to more risk of false
alarms
• End User experience
indicates good performance
only down to about 1~2% of
flow
Detection time
120
100
Time (minutes)
80
60
40
20
0
0%
1%
2%
3%
4%
5%
6%
Leak rate (% of flow)
5
Size of Spill at Detection
(bbls)
Spill size increases for
slower leaks
100
80
60
40
At RISK !
20
0
0.01
0.1
1
Leak Rate (% of flow rate)
10
6
Size of Spill at Detection
(bbls)
Combining SCADA with periodic
testing helps but…
600
60
days
30
days
7
days
500
400
SCADA
300
200
100
0
0.001
Periodic
Inspections
Environmental
Protection Gap
0.01
0.1
1
Leak Rate (% of flow rate)
HSELD
10
7
Size of Spill at Detection
(bbls)
At Risk area is substantially
reduced by HSELD
60
50
40
30
20
10
0
0.01
0.1
1
Leak Rate (% of flow rate)
10
8
External Direct Measurement
Positioned alongside
the pipeline
Installed into PVC
well screen pipe
High Sensitivity sensor cable
9
How it works
21
20
10
5
3
1
Detection at 21 hours
0
Time
(hours)
Animation based on 10 liter/hour leak rate
(0.001% of flow), 66% solids
10
Field demonstration
Tests demonstrate TT5000 detects milliliters of
fuel floating on water.
11
Test results
Sample 1
Water Only
Sample 2
Direct Fuel
Sample 3
Sensor in
sand
Sample 4
Sensor in
PVC
Sample 5
Surface Test
Sample 6
Water/Fuel Mix Test
Start Time
11:15
12:07
12:12
12:12
12:58
13:59
Start Temperature
15.5C
15.5C
15.5C
15.5C
15.5C
15 C
Alarm Time
NO ALARM
By 18:30
13:13
13:24
13:35
14:16
15:15
Ending Temperature
15 C
15 C
15 C
`
15 C
15 C
15 C
Elapsed Time
7:15
1:06
1:12
1:23
1:18
1:16
Total Fuel Used
1 liter H20
1 liter Jet A
8 liters Jet A
8 liters Jet A
10 cl Jet A
poured into
standing
water puddle
Bucket packed with
sand, 1 liter of Jet A
at the bottom, water
added to saturation
Fuel Rate:
Amount / Interval
All at once
All at Once
1 liter/ 10 min
1 liter/ 10
min
All at once
All at Once
Alarm Panel Leak
Location
N/A
1m
9m
9m
N/A
1m
Measured Distance to
Leak
N/A
1m
9m
9m
N/A
1m
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Wilcox test details
Soil Type and Condition
Leak Position
Time to Alarm
Course, damp sand
Water
Table
Above
pipe
None
Above pipe @
center of test bed
Bottom of pipe@
center of test bed
Fine, dry sandy soil
None
Bottom of pipe@
center of test bed
At bottom
of pipe
Bottom of pipe@
center of test bed
5h 39m
6h 27m
6 h,
No additional alarms
during the 9 day leak
8 days
No additional alarms
during the 21 day leak
2h
3d 21 h
Above
pipe
Bottom of pipe@
center of test bed
Course, Damp sand
Fine wet soil
Fine, wet sandy soil
1 d 12 h
Location of
Sensor Alarms
10 o’clock@ 4 ft
12 o’clock@ 6 ft
7 o’clock@5 ft
7 o’clock@ 7 ft.
7 o’clock@ 5 ft.
10 o’clock@ 6 ft.
12 o’clock@ 8 ft.
(approx. center of tank)
13
Project Design Considerations
•
•
•
•
Trench style / construction
Soil type
Ground water conditions
Degree of environmental protection
required
14
Trench Type
15
Ground water considerations
16
Where can you use
HSELD systems?
• Alongside buried single wall pipelines
• Around buried valves
• Under above ground storage tanks
• On airport hydrant fueling systems
• Anywhere you need to reduce risk in High
Consequence Areas
17
AST Applications
Typical plan view
18
Buried Valves and Manifolds
19
Cross Country Pipelines
20
Pipeline Project Installation
21
Installation layout for pipeline
120 VAC
Circuit 1
Circuit 2
Circuit 3
External Modbus
Link to SCADA
Circuit 4
Circuit 5
Circuit 6
22
Airport Hydrant Fueling Systems
23
Installation layout for airport
hydrant fueling system
24
Regulatory Considerations
• Current regulations do not typically
mandate leak detection to the level of
HSELD protection
• API 1160 recognizes HSELD
• Some environmental agencies have
formally recognized HSELD system
• Public N.I.M.B.Y. campaigns are resulting
in greater efforts by operators to exceed
regulatory requirements
25
Florida State Approval
“…TraceTek TT5000
leak detection system for
single-walled underground
bulk product piping will
provide environmental
protection substantially
equivalent to that provided
by compliance with the
requirements established in
Rules…”
26
Third Party Validation
Third party testing of TT5000
“direct bury” system by
Ken Wilcox Associates
demonstrates that TraceTek
works in single wall pipeline
applications with Jet Fuel .
“In conclusion it must be noted that proper
installation and positioning of the sensor,
taking into account the local site conditions,
is critical to reliable detection of leaks.”
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Summary
TraceTek High Sensitivity External
Leak Detection…
… fills the gap between SCADA and
periodic testing
… Provides 24/7 environmental and
system integrity monitoring
… Reduces emergency response time
by pinpointing leak location
… Has been tested, proven and
accepted by environmental
authorities
… Substantially reduces operator risk
in high consequence areas
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